Supermarket giant Tesco is set to end its 24-hour operation at four of its stores in Northern Ireland.
The outlets affected are in Banbridge, Carrickfergus, Enniskillen and Antrim Massereene.
From November 7 they will trade from 6am to midnight.
Nightshift operations will also end at a number of other Northern Ireland stores, and they will restock during the day.
The company said that in most cases the trading hours at the locations would be unaffected or subject to minor change.
Staff affected by the changes will be offered alternative roles, either within the store or within another local branch.
A spokesman said: "We're making some changes in a number of our stores to help us run them more simply and deliver the best possible service for customers. We understand that this may be disruptive for some of our colleagues, and where there have been changes to a colleague's role we will be working really hard to ensure they are fully supported."
Across the UK, 30 24-hour stores will have their opening hours reduced, and a further 149 stores will have their "night replenishment operation" moved to "daytime replenishment".